It should be. Because your HuKou is still there. You can apply for marriage with the proof given by 街道办事处 as an unemployed.
Anyway you are still a Chinese citizen. If you tell the China's authority that you have immigrated to Canada. This can't help to your problem but makes thing much complicated.
Don't release your residency status in Canada. And tell your local government authority that you are an unemployed
and want to apply for marriage. That's it.